cie-calculator-flap/lib/strategies/alg72.js

Easily generate CIE References

'use strict';

var _ = require('underscore');
var CIEStrategy = require('./cie_strategy.js').CIEStrategy;
var CIEUtils = require('./cie_utils.js').CIEUtils;
var cieUtils = new CIEUtils();

var Alg72 = function() {};

Alg72.prototype = new CIEStrategy();
Alg72.prototype = {
  execute: function(input) {

    var validationRules = {
      reference: {length: {min: 1,max: 40}},
      date: {length: {min: 8,max: 8}},
      amount: {length: {min: 1,max: 12}}
    };

    if (!cieUtils.validateInput(input,validationRules )) {
      throw new Error('Longitud invalida');
    }

    return algorithm72(input.reference, input.date, input.amount);
  }
};

module.exports.Alg72 = Alg72;

/*************************************************************************
 ****************************** Algorithm 72 ******************************
 **************************************************************************/

/**
 * Add check digits to create a final reference
 * @param {string} reference
 * @param {string} expirationDate
 * @param {string} amount
 * @returns {string} finalReference
 */
function algorithm72(reference, expirationDate, amount) {

  var condensedDateCheckDigit = processExpirationDate(expirationDate);

  var amountCheckDigit = processAmount(amount);

  var referenceCheckDigit = processReference(reference, condensedDateCheckDigit, amountCheckDigit);

  console.log('condensedDateCheckDigit: ', condensedDateCheckDigit, 'amountCheckDigit: ', amountCheckDigit, 'referenceCheckDigit: ', referenceCheckDigit);

  var finalReference = reference + condensedDateCheckDigit + amountCheckDigit + referenceCheckDigit;

  console.log('finalReference: ', finalReference);

  return finalReference;
}

function processExpirationDate(expirationDate){
  var day = expirationDate.substring(0,2);
  var month = expirationDate.substring(2,4);
  var year = expirationDate.substring(6,8);

  var dateInt = parseInt(day + '' + month + '' + year);
  var  remainderArray = new Array();
  var quotientBoolean= true;

  do {
    var quotient = Math.floor(dateInt / 36);
    var remainder = dateInt % 36;

    remainderArray.push(remainder);
    dateInt = quotient;

    if(quotient == 0)
      quotientBoolean = false;

  } while (quotientBoolean);

  var checkDigit = '';
  for (var i = remainderArray.length - 1; i > -1; i--) {
    checkDigit += remainderMap.get(remainderArray[i]);
  }

  if(checkDigit.length < 4){
    do{
      checkDigit = '0' + checkDigit;
    }while(checkDigit.length < 4);
  }

  return checkDigit;
}

function processAmount(amountStr){
  var amount = parseInt(amountStr.replace('.', ''));

  var  remainderArray = new Array();
  var quotientBoolean= true;

  do {
    var quotient = Math.floor(amount / 36);
    var remainder = amount % 36;

    remainderArray.push(remainder);
    amount = quotient;

    if(quotient == 0)
      quotientBoolean = false;

  } while (quotientBoolean);

  var checkDigit = '';
  for (var i = remainderArray.length - 1; i > -1; i--) {
    checkDigit += remainderMap.get(remainderArray[i]);
  }

  if(checkDigit.length < 5){
    do{
      checkDigit = '0' + checkDigit;
    }while(checkDigit.length < 5);
  }

  return checkDigit;
}

function processReference(reference, expirationDate, amount){
  var fullReference = reference + expirationDate + amount;
  var resultReference = '';

  for(var i = 0; i < fullReference.length; i++){
    if(!isNumeric(fullReference[i]))
      resultReference += referenceMap.get(fullReference[i]);
    else
      resultReference += fullReference[i];
  }

  var multiplier = 2;
  var digits = new Array();
  var multiplierBoolean = true;

  for (var i = resultReference.length - 1; i > -1; i--) {
    var digit = resultReference[i] * multiplier;

    if (digit > 9) {
      var subDigits = digit.toString().split('');

      digit = 0;

      subDigits.forEach(function (number) {
        digit += parseInt(number);
      });
    }

    digits.push(digit);

    multiplier = multiplierBoolean ? 1 : 2;

    multiplierBoolean = !multiplierBoolean;
  }

  var sum = 0;

  digits.forEach(function (number) {
    sum += parseInt(number);
  });

  var remainder = sum % 10;

  var checkDigit = (remainder != 0) ? (10 - remainder) : remainder;

  return checkDigit;
}

/*************************************************************************
 ********************************* Utils **********************************
 **************************************************************************/

function isNumeric(value) {
  return /^-?\d+$/.test(value);
}

const remainderMap = new Map([
  [0, '0'],
  [1, '1'],
  [2, '2'],
  [3, '3'],
  [4, '4'],
  [5, '5'],
  [6, '6'],
  [7, '7'],
  [8, '8'],
  [9, '9'],
  [10, 'A'],
  [11, 'B'],
  [12, 'C'],
  [13, 'D'],
  [14, 'E'],
  [15, 'F'],
  [16, 'G'],
  [17, 'H'],
  [18, 'I'],
  [19, 'J'],
  [20, 'K'],
  [21, 'L'],
  [22, 'M'],
  [23, 'N'],
  [24, 'O'],
  [25, 'P'],
  [26, 'Q'],
  [27, 'R'],
  [28, 'S'],
  [29, 'T'],
  [30, 'U'],
  [31, 'V'],
  [32, 'W'],
  [33, 'X'],
  [34, 'Y'],
  [35, 'Z']
]);

const referenceMap = new Map([
  ['A', 1],
  ['B', 2],
  ['C', 3],
  ['D', 4],
  ['E', 5],
  ['F', 6],
  ['G', 7],
  ['H', 8],
  ['I', 9],
  ['J', 1],
  ['K', 2],
  ['L', 3],
  ['M', 4],
  ['N', 5],
  ['O', 6],
  ['P', 7],
  ['Q', 8],
  ['R', 9],
  ['S', 1],
  ['T', 2],
  ['U', 3],
  ['V', 4],
  ['W', 5],
  ['X', 6],
  ['Y', 7],
  ['Z', 8]
]);